The Level 2 window allows us to see the Buys on the Bid, and the Sellers on the Ask.
What do you need to know about the Level 2?
MM refers to Market Maker
Price is the best price
Size is the number of shares
Each color refers to a different pricing tier.
What do you need to know about the Time & Sales?
Orders in Green occur at the Ask Price
Orders in Red occur at the Bid Price
Video on Reading the Level 2 Window